After reading through this post and replies over the last several days I figured I would respond my .02.
First let me start by saying not meaning to sound rude or biased but how can someone so worried about aluminum and cooking with it even contemplate cooking from A coffee can ?
I myself do not worry about any metals particularly or the effects they "might" have on me when im 80.
I do however consider strength vs weight possibilities in my cook kit(which I am a collector of diy cook kits and have many different ones)
I use more often than not A beer can pot with an alchy stove,but anyway my opinion on the coffee can is that as mentioned above it has been used for many years as a cooking vessel and even today some medern day train hoppers I know still use them .
I believe if im not mistaking they call them gunboats.
I think it is catching on in the survival/prepper world as well.
Again as mentioned above I would be cautious on the seams and there means of sealing them and etc.
Also of the coating used on the inside because obviously manufacturing has changed since the depression era.
If anything I would do several long boils in the pot before actually using it to cook in.
Then if you feel comfortable go with it.
But again as mentioned there are so many more options available for the same price or even cheaper.
Dollar tree can be your friend ....